A 3D model for static and dynamic analysis of an offshore knuckle boom crane

Adamiec–Wójcik, Iwona; Drąg, Łukasz; Marek, Metelski; Nadratowski, Kamil; Wojciech, Stanisław

doi:10.1016/j.apm.2018.09.006

Cited by 24 publications

(9 citation statements)

References 11 publications

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“…In previous research [32], it was proved analytically and experimentally confirmed that it is possible to build a reliable model of a composite steel-polymer concrete beam using an equivalent bending stiffness and an equivalent mass per unit length. Adopting the Hamiltonian developed in [32] and the model assumptions that the contact of the steel profile with the polymer concrete filling occurs on the entire inner surface of the steel profile and the adhesion forces prevent tangential movements within the material contact area, the steel-composite beam was modeled using rigid finite elements characterized by mass and moments of inertia, which were connected to one another using spring-damping elements [37,38].…”

Section: Rigid Finite Element Model Of the Basic Structural Componentmentioning

confidence: 99%

Rigid Finite Element Method in Modeling Composite Steel-Polymer Concrete Machine Tool Frames

et al. 2020

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At the stage of designing a special machine tool, it is necessary to analyze many variants of structural solutions of frames and load-bearing systems and to choose the best solution in terms of dynamic properties, in particular considering its resistance to chatter. For this reason, it is preferred to adopt a low-dimensional calculation model, which allows the user to reduce the necessary calculation time while maintaining a high accuracy. The paper presents the methodology of modeling the natural frequencies, mode shapes, and receptance functions of machine tool steel welded frames filled with strongly heterogenous polymer concrete, using low-dimensional models developed by the rigid finite elements method (RigFEM). In the presented study, a RigFEM model of a simple steel beam filled with polymer concrete and a frame composed of such beams were built. Then, the dynamic properties obtained on the basis of the developed RigFEM models were compared with the experimental results and the 1D and 3D finite element models (FEM) in terms of accuracy and dimensionality. As a result of the experimental verification, the full structural compliance of the RigFEM models (for beam and frame) was obtained, which was manifested by the agreement of the mode shapes. Additionally, experimental verification showed a high accuracy of the RigFEM models, obtaining for the beam model a relative error for natural frequencies of less than 4% and on average 2.2%, and for the frame model at a level not exceeding 11% and on average 5.5%. Comparing the RigFEM and FEM models, it was found that the RigFEM models have a slightly worse accuracy, with a dimensionality significantly reduced by 95% for the beam and 99.8% for the frame.

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Section: Rigid Finite Element Model Of the Basic Structural Componentmentioning

confidence: 99%

Rigid Finite Element Method in Modeling Composite Steel-Polymer Concrete Machine Tool Frames

et al. 2020

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“…Taking into consideration the above formulae, the generalised forces can be calculated according to the following: (Fig. 7a), as presented in [49,50]:…”

Section: Hydrodynamic Drag In Joint Coordinatesmentioning

confidence: 99%

“…Table 5 presents values of the first two frequencies of free vibrations of the riser analysed. Results presented in [49] are obtained for the riser divided into 1500 elements (the authors do not give information about the type of elements, but presumably either shell or solid elements are used), and our results are obtained by means of the segment method (SM) with discretisation into n = 50 elements. It is important to note that the differences do not exceed 0.1%.…”

Section: Frequencies Of Free Vibrations With Consideration Of Internamentioning

confidence: 99%

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Effectiveness of the segment method in absolute and joint coordinates when modelling risers

2019

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This paper presents two formulations of the segment method: one with absolute coordinates and the second with joint coordinates. The nonlinear equations of motion of slender links are derived from the Lagrange equations by means of the methods used in multibody systems. Values of forces and moments acting in the connections between the segments are defined using a new and unique procedure which enables the mutual interaction of bending and torsion to be considered. The models take into account the influence of the velocity of the internal fluid flow on the riser's dynamics. The dynamic analysis of a riser with fluid flow requires calculation of the curvature by approximation of the Euler angles with polynomials of the second order. The influence of the sea environment, such as added mass of water, drag and buoyancy forces as well as sea current, is considered. In addition, the influence of torsion is discussed. Validation is carried out for both models by comparing the authors' own results with those obtained from experimental measurements presented in the literature and from COMSOL, Riflex and Abaqus software. The validation is concerned with vibrations of cables and the riser with internal fluid flow as well as with frequencies of free and forced vibrations of a riser fully or partially submerged in water. The numerical effectiveness of both formulations is examined for dynamic analysis of the riser, whose top end is moving in a horizontal plane. Conclusions concerned with the effectiveness of both formulations of the segment method and the influence of torsional vibrations on numerical results are formulated.

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“…Urbaś [14] built a dynamics model of a forest crane that considered the flexibility of connections between the crane and the ground, the flexibility of links and their drives based on the rigid finite element method. Adamiec-Wójcik et al [15] implemented static and dynamic analyses of an offshore knuckle boom crane during the hoist acceleration or deceleration in a 3D dynamic model. Cibicik and Egeland [16] applied screw theory to formulate the dynamic model of an offshore knuckle crane with passive rotary joints and piston actuators and obtained dynamic reaction forces of the joints during jib luffing motion.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Lifting Mechanism of an Electric Overhead Crane during Emergency Braking

Niu

Ouyang

2020

Applied Sciences

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Mechanical brakes are essential for electric cranes when emergency braking occurs. This paper presents, for the first-time, a dynamic response analysis of emergency braking events of electrical cranes that has modelled crane components as flexible and rigid bodies. Based on the Hamilton principle, a nonlinear and non-smooth dynamic model is derived from a modified Lagrangian function and the virtual work of non-conservative forces. The dynamic responses of a 32-ton overhead travelling crane during the emergency braking process of its lifting mechanism with two service brakes determined by simulating realistic operations. The numerical results show that the loads acting on components of the crane during the braking process depend on the braking capacity and the action time of the mechanical brakes, as well as the magnitude and the initial position of the payload. When a dual-brake scheme of the lifting mechanism is adopted, the maximum load of the high-speed links and the maximum thermal power of the mechanical brake appear in the emergency braking process when one of the two brakes fails to work. In addition, it is found to be a false belief that the lower the initial speed, the lower the maximum loads acting on components of cranes become during the braking process.

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A 3D model for static and dynamic analysis of an offshore knuckle boom crane

Cited by 24 publications

References 11 publications

Rigid Finite Element Method in Modeling Composite Steel-Polymer Concrete Machine Tool Frames

Rigid Finite Element Method in Modeling Composite Steel-Polymer Concrete Machine Tool Frames

Effectiveness of the segment method in absolute and joint coordinates when modelling risers

Nonlinear Dynamic Analysis of Lifting Mechanism of an Electric Overhead Crane during Emergency Braking

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